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Representative polymerase chain reaction-restriction fragment length polymorphism analysis of the Xeroderma pigmentosum complementation group D Arg156Arg polymorphism. Lane M, DNA marker; lane 1, the AC heterozygote contains the 350- and 180-bp bands following restriction digestion; lane 2, the CC homozygote is not cleaved by TfiI and remains a single 350-bp band; lane 3, the AA homozygote is cleaved by TfiI and yields overlapping 180- and 170-bp bands.
